Clean up temporary signature images from php tmp folder

I have tried to make at patch that removes the temporary file created.

Why is self::removeTemporaryImageFile called in so many places? Could it be called earlier?

I am setting this to "Needs work" for the 46 test failures, although the 6.2.x branch shows 36 failures on automated testing with Drupal 10.2.x.

The MR has test coverage and can be committed if all the tests pass.

Automatically closed - issue fixed for 2 weeks with no activity.